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本文指出任何僅含兩個常數的氣態方程,在臨界點附近的缺點是特別顯著的。同時也指出,對應態定律應用到高密度氣體的偏差,可以相當滿意地用臨界係數(?)來衡量。因此我們建議將van der Waals方程,修改爲三常數的經驗方程,它的優點是這三個常數可以直接從氣體的臨界點數據計算出來;而且實例計算(包括極性很強和τ值很大的甲醇)說明它在相當大的温度和密度範圍內可以適用。將這個經驗式,寫成對比方程顯然含有臨界係數τ,就離開臨界點不太遠的氣體來說,這個函數關係可以相當满意地用本文方程總結出來。
This paper points out that any gas equation containing only two constants, the shortcomings near the critical point is particularly significant. It is also pointed out that the deviation of the corresponding law of states applied to high-density gases can be satisfactorily measured by the critical factor (?). Therefore, we propose to modify the van der Waals equation to an empirical equation with three constants. It has the advantage that these three constants can be calculated directly from the gas critical point data. Moreover, the calculation of the examples (including the strong polarities and the large τ values Methanol) shows that it is suitable for a wide range of temperatures and densities. Comparing this empirical formula with a comparative equation apparently containing the critical coefficient τ, the function can be fairly satisfactorily summarized by the equations in this paper for gases not too far from the critical point.